here is an example of creating a native block.... I use doc and pdf as the extensions which wouldn't be typical...just for an example of multiple extensions..
fas3170*> options fpol
fpolicy.enable on
fpolicy.i2p_ems_interval 60
fas3170*>
fas3170*> fpolicy create nativeblock screen
File policy nativeblock created successfully.
fas3170*> fpolicy ext inc set nativeblock doc,pdf
fas3170*> fpolicy options nativeblock required on
fas3170*> fpolicy monitor set nativeblock -p cifs,nfs create,rename
Warning: User requests may be denied because there are no file screening servers registered with the filer. Are you sure? yes
fas3170*> fpolicy enable nativeblock -f
Mon Mar 16 14:35:00 PDT last message repeated 2 times
Mon Mar 16 14:37:44 PDT [fas3170: fpolicy.fscreen.enable:info]: FPOLICY: File policy nativeblock (file screening) is enabled.
File policy nativeblock (file screening) is enabled.
All volumes are on by default... to turn on/off a volume... see below to turn off for a volume...
fas3170*> fpolicy vol exc set nativeblock test
fas3170*> fpolicy vol inc show nativeblock
List of volume specifications to screen:
List empty - All volumes are being monitored.
fas3170*> fpolicy vol exc show nativeblock
List of volume specifications not to screen:
test